JP2005147028A - Cooling device and method of hybrid car - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cool electric parts and mechanical parts having respective different cooling performances. <P>SOLUTION: In the case where refrigerant temperature >100°C, in order to lower refrigerant temperature of a second cooling system 2 having a mechanical part, a first valve 22 is closed, a second and a third valves 31 and 32 are opened, and the refrigerant of the second cooling system 2 is filled in the first cooling system 1. Before opening the second and the third valves 31 and 32, output of a first water pump WP 16 is raised to an output of a second WP 24 or more to raise flowing speed in the first cooling system 1. In a range wherein the refrigerant of the first cooling system 1 and the second cooling system 2 are mixed, even if temperature exceeds a set temperature 60°C of the first cooling system 1, if it is within the cooling capacity of a radiator fan 14, refrigerant at 60°C or less is supplied to an inverter unit 11 and a motor 12 (electric part) in the downstream side of a radiator 13 to surely cool the electric part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cooling system and a cooling method for a hybrid vehicle in which an engine, a drive motor, and an inverter unit are mounted. In the cooling system for a hybrid vehicle, the cooling system for the drive motor, the inverter unit, and the engine cooling system can be communicated by an opening / closing means. The present invention relates to an apparatus and a cooling method.

As a hybrid vehicle cooling device, a cooling system that cools a high-power control unit that controls driving of a driving motor, a cooling system that cools a cylinder block of an engine, and a driving motor and / or a cylinder head of an engine are cooled. A cooling system, based on the driving state of the engine and the drive motor,
The cooling system is operated so as to selectively or simultaneously cool the engine, the drive motor, and the high voltage control unit.
JP 2000-073763 A

  However, in the hybrid vehicle cooling apparatus described above, the drive motor and the engine cylinder head are cooled by the same cooling system, but the cooling required by the motor (electrical parts) and the engine (mechanical parts) is required. If the performance is different, it cannot be cooled by the same cooling system, that is, it must be cooled by a separate cooling system, which increases the number of parts, resulting in an increase in weight and cost. .

  The present invention has been made in view of the above circumstances, and two cooling systems having electrical parts and mechanical parts having different cooling performances are communicated with each other by an opening / closing means so that both parts can be cooled. An object of the present invention is to provide a hybrid vehicle cooling device and a cooling method that reduce costs by sharing and reducing the number of parts and weight.

  In order to achieve the above-mentioned object, the present invention is configured to cool the electrical component by the first cooling system and cool the mechanical component by the second cooling system, and the first cooling system and the second cooling system. An opening / closing means for communicating with the cooling system is provided, and the opening / closing means is controlled by the control means.

  As described above, according to the present invention, even if the cooling temperatures (set temperatures) of the electrical parts and the machine parts are different, the cooling systems for both parts are shared based on the communication of the cooling systems by the opening / closing means. There is an advantage that can be cooled.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a cooling device for a hybrid vehicle according to an embodiment of the present invention. The cooling device for a hybrid vehicle includes a first cooling system 1 and a second cooling system 2.

  The first cooling system 1 includes an inverter unit 11 and a drive motor 12, a radiator 13, a radiator fan 14, a cooling medium (cooling water) flow path 15, and a first water pump that circulates the cooling medium. 16. It comprises a first temperature sensor 17 for determining a first set temperature to be compared with the temperature of the cooling medium.

  The second cooling system 2 includes an engine 21 composed of mechanical parts to be cooled, a first valve 22 as an opening / closing means, a cooling medium (cooling water) flow path 23, a second water pump 24 for circulating the cooling medium, cooling It is comprised from the 2nd temperature sensor 25 which determines the 2nd preset temperature compared with the temperature of a medium.

  The first and second cooling systems 1 and 2 are controlled by control means (not shown) so as to communicate with the second and third valves 31 and 32 as opening / closing means. The first valve 22 is also controlled by the control means during the communication.

  In the first cooling system 1 of the cooling device configured as described above, it is possible to ensure the performance of the inverter unit 11 configured by electric system components that are vulnerable to high temperatures and to maintain the efficiency of the motor 12. In addition, the temperature of the cooling medium is set to a first set temperature of 60 ° C. or lower, and in the second cooling system 2, the normally set cooling medium temperature of the engine 21 is set to the second set temperature around the maximum temperature of 100 ° C. Is selected.

  Next, the operation of the hybrid vehicle cooling apparatus configured as described above will be described with reference to FIGS.

  (A) First, the case where the cooling medium temperature of the second cooling system 2 is ≦ 100 ° C. will be described with reference to FIG.

  When the temperature detected by the second temperature sensor 25 is ≦ 100 ° C., the second and third valves 31 and 32 are supplied from a control means (not shown) to raise the cooling medium temperature to the set temperature of the second cooling system 2. It is closed by a control command and prevents the cooling medium of the first cooling system 1 from flowing in.

  Further, in order to avoid a local temperature rise of the engine 21, the first valve 22 is opened by a control command from the control means, the second water pump 24 is operated, and the cooling medium is supplied to the second cooling system 2. Circulate as shown by the arrow 26 in the figure.

  The above sequence of steps is as follows. The second water pump 24 is driven → the first valve 22 is opened → the second valve 31 is closed → the third valve 32 is closed.

  On the other hand, the first water pump 16 and the radiator fan 14 in the first cooling system 1 are operated so that the temperature of the cooling medium maintains the first set temperature of 60 ° C. or less.

  For example, when the cooling medium temperature of the first cooling system 1 is 30 ° C. to 50 ° C., the outputs of the first water pump 16 and the radiator fan 14 are reduced, and when the temperature is 30 ° C. or less, the first water pump 16 In addition, the power consumption of the first water pump 16 and the radiator fan 14 can be suppressed by stopping the radiator fan 14.

  When the cooling medium temperature of the first cooling system 1 is 50 ° C. or higher, the output of the first water pump 16 is increased and the output of the radiator fan 14 is also increased. Further, when the coolant temperature is equal to or higher than the first set temperature 60 ° C., the outputs of the inverter unit 11 and the motor 12 are limited. The illustrated arrow 18 shown in the first cooling system 1 shows the flow of the cooling medium.

  (B) Next, the case where the cooling medium temperature of the second cooling system 2> 100 ° C. will be described. FIG. 3 is an explanatory diagram showing how the cooling medium flows in this case.

  In FIG. 3, when the coolant temperature detected by the second temperature sensor 25 is> 100 ° C., the first valve 22 is closed and the second and third valves are closed in order to lower the coolant temperature of the second cooling system 2. 31 and 32 are opened, the cooling medium of the second cooling system 2 is injected into the first cooling system 1, and the cooling medium temperature of the first cooling system 1 is 60 ° C. or lower. 2 is mixed in the cooling medium.

  At this time, if a cooling medium having a cooling medium temperature of 100 ° C. or higher is mixed into the first cooling system 1 having a cooling medium temperature of 60 ° C. or less, the first cooling system 1 and the first cooling system 1 The cooling medium temperature in the region where the cooling mediums of the two cooling systems 2 are mixed rises above the cooling capacity of the radiator fan 14, and the first set temperature 60 ° C. or less in the first cooling system 1 cannot be maintained.

  In order to prevent the above problems, the output of the first water pump 16 is increased to be higher than the output of the second water pump 24 before the second and third valves 31 and 32 are opened. The flow rate of the cooling system 1 is increased.

  The above series of procedures is as follows. Increase the output of the first water pump 16 → open the third valve 32 → open the second valve 31 → close the first valve 22.

  In general, the flow rate Q is expressed by Q = A × v (A: channel cross-sectional area, v: flow velocity). Assuming that the cross-sectional area of the flow path is constant, the flow rate is proportional to the flow velocity. Therefore, by increasing the output of the first water pump 16, the flow rate of the first cooling system 1 is greater than the flow rate of the second cooling system 2. It becomes possible to increase.

  The coolant temperature of the first cooling system 1 that rises due to the inflow of the coolant in the second cooling system 2 depends on the flow rate and the coolant temperature of each cooling system, so the coolant temperature is high. By increasing the flow rate of the first cooling system 1 having a lower cooling medium temperature than the flow rate of the second cooling system 2, it is possible to suppress the temperature rise within the cooling capacity of the radiator fan 14.

  Now, suppose that the first cooling system 1 is in a region where the cooling medium of the first cooling system 1 and the second cooling system 2 is mixed in the cooling medium flow path 15 upstream of the radiator 13 in the first cooling system 1. Even if the first set temperature of 60 ° C. is exceeded, the cooling medium of 60 ° C. or less is supplied to the inverter unit 11 and the motor 12 on the downstream side of the radiator 13 as long as they are within the cooling capacity of the radiator fan 14. Therefore, since the inverter unit 11 and the motor 12 are reliably cooled at the cooling medium temperature, there is no problem in cooling the inverter unit 11 and the motor 12.

  (C) Next, the case where the cooling medium temperature of the first cooling system 1 is the set temperature of 60 ° C. or higher and the cooling medium temperature of the second cooling system 2 is the set temperature of 100 ° C. or higher will be described.

  In FIG. 4, when the inverter unit 11 and the motor 12 are overheated or the engine 21 is overloaded, the cooling medium temperature of the first cooling system 1 is a set temperature of 60 ° C. or more and the cooling medium of the second cooling system 2 There is a possibility that the temperature will be 100 or higher.

  In such a case, the case where the inverter unit 11 and the motor 12 are overheated and the case where the engine 21 is overheated are divided, and the one having a larger difference from the set temperature is selected.

  (1) When the inverter unit 11 and the motor 12 are overheated.

  In this case, the outputs of the inverter unit 11 and the motor 12 are limited, the output of the first water pump 16 is set higher than the output of the second water pump 24, and the second and third valves 31 and 32 are increased. And the first valve 22 is closed.

  In this series of procedures, the outputs of the inverter unit 11 and the motor 12 are limited, the output of the first water pump 16 is increased, the third valve 32 is opened, the second valve 31 is opened, and the first valve 22 is opened. Follow the closing procedure.

  (2) When the engine 21 is overheated.

  The output of the engine 21 is limited, the output of the first water pump 16 is made higher than the output of the second water pump 24, the second and third valves 31 and 32 are opened, and the first valve 22 is closed. .

  This sequence of steps is as follows: the engine output is limited → the output of the first water pump 16 is increased → the third valve 32 is opened → the second valve 31 is opened → the first valve 22 is closed.

  In the embodiment configured as described above, the set temperature of the first cooling system is set to 60 ° C. or lower to ensure the performance of the inverter unit configured by electric parts that are vulnerable to high temperatures, and to maintain the efficiency of the motor, Since the engine is cooled by setting the set temperature of the second cooling system to around 100 ° C., both cooling systems communicate with each other as needed by the valve, and the flow rate is controlled by the water pump. While a temperature rise can be suppressed, both cooling systems can be partially shared, and downsizing is possible.

  The correspondence between the constituent elements of the claims and the present embodiment is as follows.

  The inverter unit 11, the motor 12, the radiator 13, the radiator fan 14, the cooling medium flow path 15, the first water pump 16, and the first temperature sensor 17 are the first cooling system, the engine 21, the first valve 22, and the cooling medium. The flow path 23, the second water pump 24, the second temperature sensor 25 are the second cooling system, the first temperature sensor 17 is the first set temperature, the second temperature sensor 25 is the second set temperature, The inverter unit 11 and the motor 12 constitute electric parts, the engine 21 constitutes a mechanical part, and the first to third valves 22, 31, and 32 constitute opening / closing means.

The schematic block diagram which shows the cooling device of the hybrid vehicle which concerns on embodiment of this invention. Explanatory drawing which shows a mode that a cooling medium flows when the cooling medium temperature of a 2nd cooling system is <= 100 degreeC. Explanatory drawing which shows a mode that a cooling medium flows in the case of cooling medium temperature> 100 degreeC of a 2nd cooling system. Explanatory drawing which shows a mode that a cooling medium flows when the cooling medium temperature of a 1st cooling system is 60 degreeC or more and the cooling medium temperature of a 2nd cooling system is 100 degreeC or more.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st cooling system 2 ... 2nd cooling system 11 ... Inverter unit 12 ... Motor 13 ... Radiator 14 ... Radiator fan 15, 23 ... Cooling medium flow path 16 ... 1st water pump 17 ... 1st temperature sensor 21 ... Engine 22 ... First valve 24 ... Second water pump 25 ... Second temperature sensor 31 ... Second valve 32 ... Third valve

Claims (7)

A first cooling system;
A second cooling system;
An electrical component cooled by the first cooling system so as to be equal to or lower than the first set temperature;
A mechanical component cooled by at least the second cooling system so as to be in a second set temperature range higher than the first set temperature;
Opening and closing means for communicating the cooling medium of the first cooling system to the second cooling system;
Control means for controlling communication from the first cooling system to the second cooling system by the opening and closing means;
A cooling device for a hybrid vehicle, comprising: The cooling device for a hybrid vehicle according to claim 1,
When the coolant temperature of the first and second cooling systems is lower than the first and second set temperatures, respectively, the electrical parts are cooled by the first cooling system by closing the opening and closing means, A cooling device for a hybrid vehicle, wherein the second cooling system controls the mechanical parts to be cooled. The cooling device for a hybrid vehicle according to claim 1,
When the cooling medium temperature of the second cooling system exceeds the second set temperature and the cooling medium temperature of the first cooling system is lower than the first set temperature, the opening / closing means is opened. The cooling medium outflow side of the first cooling system communicates with the cooling medium inflow side of the second cooling system, and the cooling medium outflow side of the second cooling system and the cooling medium inflow side of the first cooling system are connected to each other. A hybrid vehicle cooling apparatus comprising: a communicating cooling system that controls electric parts and mechanical parts to be cooled by the communicating cooling system. The cooling device for a hybrid vehicle according to claim 1,
When the cooling medium temperature of the first cooling system exceeds the first set temperature and the cooling medium temperature of the second cooling system exceeds the second set temperature,
By opening the opening / closing means, the cooling medium outflow side of the first cooling system and the cooling medium inflow side of the second cooling system are communicated, and the cooling medium outflow side of the second cooling system and the first cooling system are communicated. The cooling medium inflow side is communicated, and control is performed so that the electrical parts and the machine parts are cooled by the communicated cooling system,
Determine which of the electrical or mechanical parts is overheating, reduce the output of the overheating device, and make the flow rate of the cooling system on the overheating side higher than the flow rate of the cooling system that is not overheating. A cooling system for a hybrid vehicle, characterized by being controlled. The cooling device for a hybrid vehicle according to claim 3,
The cooling medium of the first cooling system is such that the drive output of the first cooling system is controlled so that the flow rate flowing through the first cooling system is faster than the flow rate flowing through the second cooling system. A cooling device for a hybrid vehicle that is characterized. The cooling device for a hybrid vehicle according to claim 1,
The electrical component is a motor that drives a vehicle and an inverter that controls the motor,
The cooling device for a hybrid vehicle, wherein the mechanical component is an engine for driving a vehicle. A process of cooling the electrical components in the first cooling system so as to be equal to or lower than the first set temperature;
A process of cooling the mechanical parts by at least the second cooling system so as to be in a second set temperature range higher than the first set temperature;
An opening and closing process for communicating the cooling medium of the first cooling system to the second cooling system;
A control process for controlling communication from the first cooling system to the second cooling system by the opening and closing process;
A cooling method for a hybrid vehicle comprising:

Images